Abstract:
22Na(p, γ)
23Mg and
19Ne(α, p)
22Na are two crucial reactions in the so-called NeNa-MgAl cycle and the rapid-proton process, their astrophysical reaction rates are indispensable inputs in understanding the outburst mechanism and element synthesis of novae. Since many proton resonance levels in odd-A compound nucleus
23Mg may be involved at nova temperature, existing measurements can only provide partial effective information on the
22Na(p, γ)
23Mg reaction, large discrepancies still exist in the astrophysical reaction rates of the two reactions. In the present work,
22Na+p resonance scattering via thick target inverse kinematics was studied at RIBLL1 radioactive beam line in the HIRFL national laboratory at Lanzhou. Excitation functions of
22Na(p, p) are obtained in the energy range of
Ec.m. = 1.5 to 4 MeV. Obvious resonance structure is observed in the
23Mg compound nucleus, resonance parameters are deduced for 22 proton resonance states in
23Mg via R-matrix analysis, which will be used for the evaluation of the astrophysical reaction rates of
22Na(p, γ)
23Mg and
19Ne(α, p)
22Na.
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